Method of joining metal articles



G. KBLER.

METHOD 0F JOTNING IVIETAI ARTICLES. APPLICATION FILED MAR.3.1921.

1,407,202, Patented Feb. 21, 1922.,

Egfla Be it known that I, GOTTFRIED KBLER,

UNITED STATES PATENT` OFFICE..

GOTTFBIED ICBLEB.. or KIEL-Gilman, GERMANY, .sssIGNon 'ro FRIED.' Knorr mmNeEsELLscHArT GERMANTAWEBFT, or` KIEL-GAARDEN, GERMANY. i

METHOD or .Tommie METAL ARTICLES.

i Specification of Letters Patent. Patentd Feb, 21, 1922.

Application led March 3, 1921..4 Serial No.'449,506.

To all 'whom t may concern residing at Kiel-Gaarden, Germany, a citizen of the German Republic, have invented a certain new and useful Improvement in Methods .of Joining- Metal Articles, (for which I have 4filed an application in Germany, January 21, 1920,) of which the following is a specification.

This invention relates to a method of joining weldable metal articles with such as are are made of the'non-weldable metal or such welding only with difliculty, and withwhich the weldable metal articlesl are then welded in the manner known per se.

The invention will be further described with reference to the accompanying drawing which illustrates some forms of execution of the present method by way of example. t

In this drawing- Fig. 1 discloses the manner of joining two circular metal plates.

Figs. 2 and 3 are similar views showing the use of a plug as a suitable mechanical supplementary means,v

Figs. 4 and 5 illustrate the manner of joining a heat insulating plate to the piston head of an internal combustion engine.

In all the figures the two bodies to be interconnected are denoted by the referenceletters A and B, respectively, A indicating the body which is non-weldable or weldable only with difiiculty, and B the body possess- 4ing good welding properties. 'C and D are In the form of execution according to Fig. i

2, where it is a question of joining two similar plates, there is inserted in the centre :of the bottomf plate A a plug D of good weldable metal. This plug is provided with a depression having the shape of a truncated cone into which the welding metal E is poured on the welding operation after the plate B in which there is formed an opening having the shape of an oppositely disposed truncated conehas been suitably positioned. The form of execution shown in Fig. 3 differs from the form just described solely by the fact that the plug D has the form of and is inserted after the manner of, a rivet from below into the bottom plate A and slightly projects into the top plate B to be connected. The manner of welding the plug D to the plate B is identically the same as in the example illustrated in Fig. 2.

In the place of a single plug or rivet any desired'number of such supplementary elements, adapted to be mechanically connected with the poorly weldable metal plate, may obviously be made use of andarranged in a suitable manner across the entire contact surface of the plates destined to be joined.

For the purpose of avoidingheat 'stresses when the parts cool down after welding, or whenever there is any liability of the two plates, intended to be joined the one with the other in accordance with this invention suffering unequal degrees of expansion in the course of subsequent service, owing to the different material of which they are made, it has been-found expedient to so susA shape the one of the two plates as to enable ecution is illustrated in Fig. 4. In this case it is a question of fitting a heat insulating plate to the piston head of an internal combustion engine.A As will be observed, the insulating plate B is welded up both with a dove-tailed ring C inserted along the piston edge, as also with a plurality of plugs D inserted into the piston surface. The plate is providedy with an undulating surface which will admit of a free expansion of said -to said element, one of said members to be which consists'in mechanically connectingl with the plugs inserted into the piston head,

' cure a specially favourable transmission and `delivery of heat on the part of the insulating A ber with a non-.weldable member which con-` it to expand relative to the other member.

elements of weldable material to said nonweldable article and welding said elements to said weldable article, said undulations permitting an expansion of said weldable artlicle with respect .to said non-weldable artic e.

3. A method of joining an undulated member of weldable material to a member of non-weldable material which consists in mechanically connecting elements of weldable material to said Ynon-weldable member and welding said elements to said undulated member, said latter connections occurring at the crest of said undulatons.

4. A method of joining an undulated insulating plate of weldable material to a piston head of non-weldable material which consists in mechanically connecting plugs of weldable material to said piston head and t o a dove-tailed ring disposed along the iston edge and welding. said undulated p ate to said plugs.

The foregoingspecification signed at Kiel, Germany, this 6th day of January, 1921.

GOTTFRIED KBLER.

In presence of- F. GULIMAT, HAGEMANN.

insulating plate relatively to the piston head A at different degreesof heating.

The form of execution shown in Fig. 5 and likewise covering a method of joining the 'piston head to its insulating plate, differs from that according to Fig. 4 merely by the fact that the insulating plate is raised so as to lie hollow at the points where it is jointed whereas at the sections between the plugs it lies perfectly close with the piston head. This form of execution will be found to seplate. A

Claims. 1. A method of joining a weldable memsists in mechanically uniting an element of weldable material with the non-weldable member and welding said weldable member joined having an undulated shape to enable 2. Al method of joining an undulated shaped' metal article Aof-weldable material to a metal article of. non-weldable material 

